<div el-container
     direction="vertical"
     class="app-container">
  <div el-header
       height="100px">
    <div el-row>
      <div el-col
           span="6">
        <div class="grid-content logo">
          logo
        </div>
      </div>
      <div el-col
           span="14">
        <div class="grid-content search-bar">
          <el-input [model]="searchKey"
                    placeholder="请输入内容"></el-input>
          <el-button type="info">搜索</el-button>
        </div>
      </div>
      <div el-col
           span="4">
        <div class="grid-content">
          <el-dropdown [model]="menuItems"
                       [split-button]="true"
                       type="primary">
            liudong
          </el-dropdown>
        </div>
      </div>
    </div>
  </div>
  <div el-main>
    <div>
      <el-button type="primary"
                 [routerLink]="['/exam']">进入考试</el-button>
    </div>
  </div>
</div>